Phosphorus deficiency-Strawberry

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Nutrients

Strawberry - Discolouration

Symptoms
Symptoms begin at mature leaves. Leaves are dark green and a bit smaller than normal. With ongoing phosphorus deficiency leaf blades show a purple tint. Tinting becomes brighter as leaves age and approach early senescence. Fruits and flowers tend to be smaller and fruits can develop albinism.

Causes
Phosphorus deficiency Petioles of phosphorus deficient leaves contain less then 700ppm acetic acid soluble phosphate-phosphorus, dry basis.

Strawberry - Discolouration

Causes
Phosphorus deficiency Petioles of phosphorus deficient leaves contain less then 700ppm acetic acid soluble phosphate-phosphorus, dry basis.

Strawberry - Discolouration

Symptoms
Symptoms begin at mature leaves. Leaves are dark green and smaller than normal. With ongoing phosphorus deficiency leaf blades show a purple tint. Tinting becomes brighter as leaves age and approach early senescence.

Causes
Severe phosphorus deficiency Petioles of phosphorus deficient leaves contain less then 700ppm acetic acid soluble phosphate-phosphorus, dry basis.

Strawberry - Chlorosis

Symptoms
The first indications of a deficiency are a dull, deep green or bluish-purple discoloration of the plant and a reduction in leaf size. As the deficiency worsens the upper surface of the leaves develops a dark, metallic sheen while the underside becomes reddish-purple. Mature leaflets show marginal chlorosis with subsequent dark brown necrosis, starting from the leaf tips.

Causes
Phosphorus deficiency Symptoms are worse during cold and dry growing conditions and at high pH values, all of which render the P less available.

Phosphorus deficiency made worse by

Acidic or very alkaline (calcareaus) soils
Low organic matter
Cold or wet conditions
Crops with a poorly developed root system
Soils with low P reserves
Soils with a high phosphate capacity
Iron rich soils

Phosphorus is important for

Stronger plants, healthier plants with more resistance to cold weather
Bigger bolder berries
Improves efficiency of fungicide sprays
Reduces incidence of botrytis
Firmer berries with better storage potential
Increases shelf life

Yara recommended fertilisers for Phosphorus deficiency

YaraVita SENIPHOS

Strawberry (field grown): Non-everbearing varieties, 3 applications of 10 l/ha from start of flowering. Repeat applications at 7-10 day intervals. Everbearing varieties, divide a total rate of 30 l/ha into 6 applications of 5 l/ha. Do not apply successive applications at intervals of less than 10-14 days. Water rate: 500 l/ha.